Windows Server 2008 R2 Enterprise edition virtual machines licenses

The following KB articles cover troubleshooting the errors you mention:

• http://support.microsoft.com/kb/950755
• http://support.microsoft.com/kb/938450
• http://support.microsoft.com/kb/942969

The first KB article recommends re-entering the key to resolve your first error, and for the second two (which have the same error), your best bet will be to call the Microsoft Product Activation Center here: (888) 352 7140. The last two errors indicate that the MAK key has been activated more times than the key allows, and they can increase the number of activations at that phone number.

Nothing. the MAK is a "normal" MAK - it allows multiple activations, but it also invalidates, like all activations, on hardware changes. At least this was my understanding from the start (can you provide a quote from the doc saying it does not need reactivation?).

That said, my experience with them is limited - I run a KMS because it is a lot easier.